I'm starting to learn hugo. When using hextra via https://github.com/imfing/hextra-starter-template and cloning the repository on a PC, the test page with mermaid diagrams works, but I'm confused by the absence of the rest of the hugo folders in the project. Installation according to instructions:

1. Hugo Modules (Recommended)
2. Git Submodule

mermaid diagrams doesn't work

• v0.122.0-b9a03bd59d5f71a529acb3e33f995e0ef332b3aa+extended windows/amd64 BuildDate=2024-01-26T15:54:24Z VendorInfo=gohugoio
• Chrome, Windows
• 0.7.2